Microtelephone.



No. 679,405. Patont ed July 30, IBM.

E. VOLKERS.

MICROTELEPHONE.

(Apphcatmn filed Mar 22 1901) (No Model.)

ma pal/mm,

Z w a UNTTED STATES PATnNT Orrien.

EMIL VOLKERS, OF BERLIN, GERMANY.

iVIICROTELEPHONE.

SPECIFICATION forming part of Letters Patent No. 679,405, dated July 30, 1901.

Application filed March 22, 1901. Serial No. 62,347. (No model.)

1'0 all whom. it nuty concern:

Be it known that I, EMIL VOLKERS, a subject of the Emperor of Germany, residing at Berlin, Germany, have invented a new and useful Microtelephone, of which the following is a specification.

This invention relates to microtelephones, or telephone apparatus comprising a tele phone or receiver and a microphone or transmitter.

The principal object of the invention is to provide telephone apparatus of exceedingly simple and economical construction which when once the parts are assembled will not again require adjustment or regulation of any of its parts, whereby the apparatus may be supplied at very low cost and will be especially adapted for hard usage in inexperienced hands.

With this object in view the invention consists in the improved construction, arrangement, and combination of the parts of a telephone apparatus, which will be hereinafter fully described and afterward specifically pointed out in the appended claims.

In the accompanying drawings, which illustrate a telephone apparatus constructed in accordance with my invention, Figure 1 rep resents the complete apparatus in vertical central section, the handle being shown in elevation. Fig. 2 represents a view of the same in front elevation,with the mouthpieces and diaphragms removed to expose the interior.

Like letters of reference mark the same parts in both figures.

Referring to the drawings by letters, A indicates the receiver, and B the transmitter, which are shown in this instance as mounted upon parallel branches of a wire 0, which is bent at its upper end at O to form an eye, by which it may be conveniently hung up when not in use. From this eye the two branches are passed through or secured to the receiver and continued to the transmitter, where they are similarly or otherwise secured, the receiver and transmitter being secured at a proper distance apart to be in position for use, the former at the ear and the latter at the mouth of the operator.

While the construction thus described is eminently practicable, it will be readily seen that there is no absolute necessity for the employment of two wires or that they shall be parallel, as a single wire or bar might be used or the two wires be wider apart at one end than at the other, the special object of the arrangement being to connectthe receiver and transmitter upon a support, so that the diaphragms of both will be in substantially the same vertical plane.

I may provide a handpiece D below the transmitter, made of suitable non-conducting material, which will facilitate the handling of the instrument, but is not absolutely necessary, as the instrument might be held by grasping any part of it in the hand.

The circuit-wires connect the receiver and transmitter, as is usual in telephones, and I have shown a protecting-tube g for containing them; but this may be dispensed with and the ordinary insulated wires used without protection.

The receiver comprises a box a, of any suitable material, having its front end open, and a cover Z), provided with a peripheral flange 'or rim b to snugly fit upon the open end of the box, the plate or cover Z) forming the dia phragm, and the rim securing it in position upon and closing the box.

I preferably provide a mouthpiece c for the purpose of concentrating the sound-waves, although the instrument would be operative without it.

Within the box a is arranged and secured an electromagnet or magnet d, which I illustrate as composed of a plurality of lamellzu of steel or soft iron, as the case may be, as clearly shown in Fig. 2, which is the preferable construction,although the electromagnet or magnet would be operative if made in a single piece. The magnet consists of a main body (1, a central pole (Z and side poles d (1, the outer ends of all of the poles being in approximately the same plane, and the central pole (Z is wrapped with the circuit-wire, forming a coil f about it in a spool f, the ends thereof passing through the transmitter and then. to the line.

The magnet or electromagnet is adjusted to its proper position in the box with reference to the diaphragm in the following manner: The box a is partly filled with a liquable mass h-for instance, a mixture of asphalt, Wax, oil, or the like. The magnet or electromagnet is dipped into the still soft mass and the sheet-iron cover is placed on the box after a thin sheet of paper or the like has been placed between the diaphragm l2 and the working pole of the magnet or electro magnet. The latter is now excited by a current of electricity being sent through the coil f, when the electromagnet or magnet will be attracted by the iron diaphragm. The liquable mass, now cooling, retains the electromagnet or magnet in this position, so that after the mass has solidified and the interposed sheet of paper or the like has been re moved the magnet or electromagnet has the proper distance from the diaphragm. The thickness of the interposed material has to be predetermined according to the circumstances.

The transmitter 13 consists of a box, preferably of metal, with cover and'mouthpiece of substantially the same form as described with reference to the receiver. Within the box are arranged two dished disks 6 and 70, between which is held a layer of felt or the like Z by means of a central nut-and-screw arrangement m. The disks are fixed in the box by a liquable mass h being poured into the box in molten state and allowed to cool and solidify while the disks are being held centrally in the proper position by a suitable means, to be removed after the mass has solidified. The circular edge of the felt layer protrudes above the edges of the dished disks and above the rim of the containing-box. Into the hollow of the inner disk It, which preferably is gilded to prevent oxidation, is filled granulated carbon. If now the cover is placed upon the box, the edge of the felt layer presses against the diaphragm of the cover and prevents thereby carbon particles from falling out. The disks and the diaphragm are electrically connected to the linewires.

The bent-wire handle is carried through the receiver and through the transmitter and is held therein by the solidified liquable mass. With its lower end it is secured in the handle part D, which, as was stated above, may also be dispensed with, in which case the free ends of the bent wire terminate within the transmitter. By means of its upper closed end it may conveniently be hung upon a rigid or switch hook, as the case may be.

What I claim, and desire to secure by Letters Patent, is-- 1. A telephone-receiver comprising an ordinary open box, an ordinary sheet-metal cover therefor, provided with peripheral turned-over portion or portions, snugly fitting said box, and an electromagnet and securing means wholly within said box.

2. A telephone-receiver comprising an open box, a magnet held therein in a bed of liquable material, and an ordinary cover for the box forming the diaphragm, substantially as described.

3. A telephone-receiver comprising an open box, a magnet held therein, an ordinary cover for the box forming the diaphragm, and a slipcover mouthpiece partially covering and protecting the diaphragm and concentrating the sound-waves, substantially as described.

4:. A telephone-receiver comprising an open box, a magnet therein embedded in a mass of liquable material and wholly supported thereby, and a diaphragm supported by the box, substantially as described.

5. A microtelephone comprising a receiver and a transmitter each comprising a box for containing its inner mechanism,and a straight handle passing into each box and embedded therein in a mass of liquable material, substantially as described.

6. A microtelephone comprising a receiver and a transmitter, each comprising a box for containing its inner mechanism and a support or handle passing into and embedded in each of said boxes in a mass of liquable material, substantially as described.

7 A microtelephone comprising a receiver and a transmitter, each comprising a box for containing its inner mechanism and a support or handle passing into and embedded in each of said boxes in a mass of liquable material, the diaphragms of both receiver and transmitter located in practically the same plane,

substantially as described.

8. A microtelephone comprising a receiver and a transmitter each comprising a box for containing its inner mechanism, and a standard or support comprising two wires secured to the transmitter and receiver joined together above the receiver in the form of a loop, substantially as described.

9. A microtelephone comprising a receiver and a transmitter, each comprising a box for containing its inner mechanism, and a wire standard or support bent into reversed- U form, the two branches passing through the receiver and into the transmitter and embedded in each in a mass of liquable material, the upper end serving as a convenient loop for hanging up the instrument, substantially as described.

In witness whereof I have hereunto set my hand in the presence of two witnesses.

EMIL VOLKERS.

- Witnesses:

WOLDEMAR HAUPT, HENRY HASPER.

ICC 

